Bolt and locking sleeve



Aug. 4, 1931. H. v. HAIGHT BOLT. AND LOCKING SLEEVE Filed April 4, 1928INVEIyToR. Harz YJIaL'yhf BY @g HAS ATTORNEY dal@ Patented Aug. 4, 1931PATENT OFFICE HARRY V. HAIGH'I, OF SHERBROOKE, QUEBEC, CANADA, ASSIGNORTO INGERSOLL- RAND COMPANY, OF JERSEY CITY, NEW JERSEY,

A CORPORATCN OF NEW JERSEY BOLT AND LOCKING SLEEVE Application filedApril 4,

This invention relates to rock drills, but more particularly to asupport for the front endof a feed screw used for actuating a Vrockdrill longitudinally of the shell whereby 5 the rock drill is supported.

The objects of the invention are to maintain the support in axialalignment with the feed screw and to form a rigid connection between thesupport and the shell to which it La is secured.

Other objects will be in part obvious and in part pointed outhereinafter.

In the accompanying drawings in which similar reference characters referto similar ,5 parts,

Figure l is a longitudinal sectional elevation of the front end of arock drill shell having the invention appliedthereto,

Figure 2 is an end view of the feed screw 0 support, and

Figure 3 is a transverse view taken through Figure 2 on the line 8-3looking in the. direction indicated by the arrows.

Referring to thedrawings, A designates 5 Ihe front end of a rock drillfront head in which is inserted a drill steel B. The rock drillindicated may be of the drifter type and is supported by a shell C in awell known manner, the rock drill being provided with i the usual guides(not shown) which cooperate slidably with guideways D in the body C ofthe shell C.

As is customary in apparatus of this type, the shell C is equipped witha feed screw E I for actuating the rock drill longitudinally of theshell. The connection between the feed screw E and the rock drill is notshown but this may be of a well known construct-ion as may also be themeans, such as a crank handle (not shown), for rotating the feed screw.

In accordance with the practice of the invention the shell body C isprovided with a support F at the front end of said shell to support theend of the feed screw E. The support F accordingly has a bore G torotatably receive a plain cylindrical end H of the feed screw E.

On the front end of the shell body C are lateral lugs J in which areformed tapered apertures K. Similarly, the support F is 1928. Serial No.267,239.

provided with lateral lugs L which lie in the same plane as the lugs .lof the shell body and are also provided with tapered apertures Theminimum diameters of the tapered apertures K and O are preferablysomewhat larger than the diameter of bolts P inserted in the taperedapertures for clamping the support F to the shell. The bolts P areprovided with nuts Q, for this purpose.

As is well known devices of the type to which the present inventionpertains are subjected to terrific vibration during the operation of therock drill. Due to this condition it is difficult to maintain a rigidconnection between the feed screw support, such as the support F and theshell body C, since any slight clearance in the apertures through whichthe bolts P extend will, after a brief period of operation, causeexcessive wear on the cooperative surfaces of the bolts and theapertures through which they extend. Such wear will of course permit ofsome relativo transverse movement between the support and the shell withthe result that the feed screw E follows a gyratory movement which, whenunchecked, results in serious injury and frequent breakage of the feedscrew as well as such portions of the rock drill to which the feed screwmay be connected.

In order to form an absolutely rigid connection which will be unaffectedby the vibration of the drill, ferrules l having unbroken peripheralsurfaces are disposed on the bolts P wherewith they are in bodycngagemcnt, such as a slice fit. The ends of the ferrules R are suitablytapered to correspond to the tapered apertures K and O into which theyextend. rThe ferrules are preferably of such length that their ends willlie below the surface of the plates and spaced from the bolt head andthe nuts Q.

Preferably the taper on the fcrrules is such that the wall of theferrules at the ends is comparatively thin. lVhen the nuts Q aretightened on the bolts and the support F and shell body C are drawntogether, the walls of the tapered apertures in these members willfrictionally engage the tapered peripheral surface of the ferrules. Thefer-rules are Cil SCI

ifi

thereby secured firmly Within the apertures and the thin ends of theferrules will be pressed into gripping relation with the bolts P. Arigid structure will be thus Vformed and theehances of relativetransverse movement between the severa-lelements comprising. the supportforthe front endAv ofV the feed screw Will be obviated.

l claim:

1, ln a connection for rigidlyl securing together a pair of members,said members hav-V ing apertures adapted to register one With another, abolt extending through a pair of registering apertures in the membersfor drawing said members together, a tapered portion in each of saidapertures disposedwith tlie'ends of greater cross sectional' area at theadg'acent ends of the membersfaf errule disposed about the bolt andhaving oppositely ytafpe'ed portions adaptedV to be forced intorictional engagement with the Walls of the tapereda portions orp theapertures, the Walls of saidV ferrule at the ends being relatively thinto permit their being distorted integr-ip- 3 ping relation With saidbolt to prevent rela tive movement between theV ferrule and the bolt.

2. In ay connection for rigidly securing. to

gether a pair of members, said members having apertures adapted toregister oneiivith an-V other, a bolt extending through a= pair ofregistering apertures in the members and having means engaging theopposite sid/es of said members tor'dravving.I said members togethenf itapered portion in the apertures,` aiterrule disposed on the bolt withthev ends olii thel erriile spaced from the engaging means and having anoppositely tapered unbroken pe-v ripheral surface to correspond With thetai nered apertures and With which the Walls of the tapered aperturesrictionally engagey When pressure is applied to the engaging means todraw said members together tor pre# vent relative movement between'theinembers and the ierrule,V saidl ferrule having relatively thin'-Walls at one end adapted to be distorted into gripping relationshipWith-the bolt to prevent relative movement betvveen:V the fer-v rule andthe bolt. e

In testimony whereof I have signed this specification.

HARRY V. HAIG'HT.

